Hot-air furnace



March 9 1926.

INVENTOR ATTORNEY Patented Mar. 9, T9255.

UNT-D STATES 'laila-@2d i FRANK Z. AHL. 0F SACRAMENTO, CALIFORNIA.

Application filed G'ctober 29, 1924. Serial No. 746,550.

To .'ZZ whom it may concern Be it known that l, FRANK Z. Ann, a citizenot the United States, residing at Sacramento, county or" Sacramento,State ot California, have invented certain new and use-p iifulImprovements in Hot-Air Furnaces; and I do declare the following to be afull,` c`ear, and exact description of the same. reference being had tothe accompanying drawings, and to the characters of reference markedthereon, which form a part ot this application.

This invention relates to improvements in heat furnaces et the naturaldraft hot air supplying type, and particularly to one. using gas orsimilar tucl.

The principal object. of my invention .is to construct a furnace oi:this characters() that a very large heated surface against which the aircomes in contact will be provided in proportion to the size ot thefurnace and the amount ot fuel consumed.`

Another object is to arrange suitable air intake and outlet baille ordeilector means in such a manner that a large amount ot the incoming airto be heated will trst be deflected to pass adjacent the hottest surfaceot' the furnace betere passing out through the distributing pipes. Atthe same time the air circulating past the less heated surface will beprevented from too quickly escaping' from the furnace, thereby insuringthat such air will be well heated by the time it passes.

out from said furnace. Nevertheless 'the passage of the air from theintalz'eto the outlet is not obstructed sui'iiciently to hinder theproper amount of draft from being created and automatically maintainedwith the operationoi2 .the furnace.

A further object is to provide simple means Jr'or preventing anymoisture of condensation of gas in the discharge flue from draining backinto the 'furnace itself.

A further object of theinvention is to produce a simple. and inexpensivedevice and yet one which will be exceedingly effective tor the purposetor which it is designed.

These objects l'. accomplish by means of such structure and relativearrangement of parts as will 'fully appear by a perusal of the followingspecitication and claims.

In the drawings similar characters of reterence indicate correspondingparts in the several views:

Fig. 1 is a sectional elevation ot thefur- 118C@- Fig. 2 is a `sectionalplan on the line 2-2 n of Fig. 1. y Referring vnow more particularlytothe characters of reference on the drawings, the numeral 1 denotes acylindrical shell supported from the ground or floor and'having on itsupper end a truste conical cap '2. Air outlets 3, from whichdistrlbuting pipes lead to the various rooms to be heated, project fromthe sides of the cap, the top ot which is concave in the form ot aninverted cone, as at 4.

Mounted centrally in the shell and closed both at top and bottom is themain lire chamber 5, at the lower end of 'which is located an upwardlyfacing gas or other suitable burner 6, the necessary air for whichobtained from apassage 7 leading from said chamber to the outside of theshell.

Surrounding` the chamber 5 and concentric therewith is a drum Sextending to the top. of said chamber but terminating short ofthebottomthereof and' of 'the bottom or the shell. The inner periphery otthis drum is spaced a suitable distance :trom the chamber to leave theair passage 9 open from the shell below thechamber tothe cap 2thereabove.V Air from youtside the shell is -admitted tofthis passagethrough a side opening 10 therein belowthe chamber The outer peripheryoif the drum deeply7 corrugated from top to bottom as shown lat11,'thereby greatlyincreasing the surface area of this drum over whatlwould be the case if the drum were painly cylindrical. The bottoms ofthese corrugations'are spaced a suitable distance from the innerperiphery of the drum, while the outer edgesthereot are similarly7spaced from the shell.

The drum is closed at top and bottom eX- cept for passages 12 adjacentthe top thereof leading from the top ot the chamber 5, and an outlet 13at the bottom ofthe drum onthe side thereof opposite to the passages 12.This outlet 13 connects witha discharge pipe or flue lfl preferablyplaced between two adjacent. eorrugations 11 and extending to the topthereof. At this point said flue joins on to a horizont-al portion '15which passes through the shell, the lower side ot' this horizontalportion having a downward slant. away from the flue 14, as shown at 1G.Since this horizontal flue, away from the direct heat, is the portion inwhich condensation is most liable to form, it will b e seen that owingto its downward slantany moisllO tureftherein will run in a directionaway 'troni the Hue lll and not into the saine.` y

Depending inwardly fron'i the shell adjacent the lower end of theV drinnand at a downward angle is an air detlecting ring 17 having a centralopening concentric with the chamber This causes air entering the shellthrough the side opening l0 to be deflected toward the center ot thefurnace,

anl causes the majority ot the air to pass up through the passage 9between the highly heated surta es of the drinn and chamber. This air onpassing up clear ot the drum strikes the cone -t and is deflected towardthe outlets o.

Projecting mmuuy from t'lie shell il" about the top of the drum is ahorizontal.

detlectingring: l8,ei\jtending across the space l) between the shell andthe drum, and inwardly from said space extending upward ly substantiallypa 'allel to the sides ot the cap 2, as shown at 20. This causes the airpassing up between the shell and the drinn to be somewhat retardedduring such passage, insuring thatthe air willbe well heated j l andforcing the same toward the center of lill `without any relatively coolcurrents.

The shell cap and outlets, although not so shown in the drawings, willof course be covered with asbestos or similar heat retaining means, asis customary in the industry.

As is customary `in hot air furnaces,- a water vessel Q1, vopen at thetop, is mounted in the' shell l just above the intakeflue 7,

and extending across the air passage 19, to keep the an" moist. Thisvessel projects to the outside ol' the shell,` so that it may j bereadily filled, the exterior portion* being closed by a removable cover22.

Frein the foregoing.description it will be readily seen `that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

lVhile this specification'sets forth in dctail` the present andpreferred construction of thedevice, still in practice such deviations`troni 'sncli detail may be` resorted to as do not torni a departureyfrom the spirit ot the invention, as defined by the appendedclaims. j j

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is: j

l. ln a hot air furnace havinga vertical shell, a drum therein spacedfrom the shell, airintake means below the `drum where# by ail-may passupwardly between the shell and drum, means for heating the drum, and acap on the shell having openings inits sides; an air detlecting ring inthe shell above the drum, saidring coinj'irising a horiT zontal portionextending from the shell to a point inwardly of thev outer peripheryotIthe druni above but close to the latter, and a tapering portionextending upwardly and inwardly at an acute angle from the inner end etsaid horizontal portion` Q. In a hot auturnace havinga vertical shell, adrum therein spacedfroni the shellV andprovided with a` central opening,from end to end, airlintake means below` the drinn whereby. air may passupwardly either through theV central openinger between the drumandslielhineans for heating the drum and a cap on the shell; airdetlecting means Vin the shell below the drum but above the tu re. v

FRANK Z. AHL.

